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ADOLPH SPIEGEL, on HoeHsT-oN-THn-MAIN, GERMANY, ASSIGNOR TO-FARB- WERKE,VORMALS .MEISTER, LUOIUS & BR'UNING, on SAME PLACE.

Azo COLORING=WIA+TER SPECIFICATION forming part of Letters Patent No.302,790, dated July 29, 1884.

Application filed January 10, 1884.

To all whom it may concern:

Be it known that I, ADoLPH SPIEGEL, doctor of philosophy, a citizen ofthe Empire of Germany, residing at Hochst-onthe-Main, in

the Empire of Germany, have invented certain new and useful Improvementsin the Production of Fast Azo Colors upon Textile Fabrics, of which thefollowing is a specification.

My invention relates to the manufacture of IO a new coloring-mattersoluble in water from an axe coloring-matter insoluble in water, butsoluble in spirit, which colorii1g-matter is derived fromortho-amido-phenol.

In carrying out my invention I first prepare the azo coloring-matterdichlorphenol-aza betauaphthol of the formula- S OH I (B) 0,,H, Cl, :NO,H,,.OI

hereinafter using this name to designate it.

To prepare this compound Itake the body known as ortho amidodichlorphenol, which may have been prepared in various ways- -as, forinstance, by reducing the ortho- 2 5 nitro-diehlorphenol of F. Fischer,(Zeitschrift fiir Chemic. ,1868, p. 386.) The amide-dichlorphenolisdiazotized in the well-known man ner, and the diazo-dichlorphenol ofSchmidt and Glutz, (Berichte der Deutchen, Chem, 0 Gcs, II, p.52,)alyellowish-brown body of C 2 the formula 0 H, 0 N

:N is obtained. The

diazodichlorphenol is combined with a mole- 3 5 cular quantity ofbeta-naphthol, according to the method well known to chemists, therebyproducing the scarlet-colored salt of the scarlet-co1ored azocoloring-matter dichlorphenolazobeta-naphthol. This compound is distinf(Specimens-l In order to convert the azo coloring-matter just definedinto the new coloring-matter soluble in water, I take, say, fourteenpounds in the shape of a paste or of a fine powder, and thereunto I add,say, one hundred-weight of spirits of wine along with, say, twenty-eightpounds of a concentrated solution of the bisulphite of an alkali. Themixture is now, in a closed vessel, or in one supplied with a reversedcooler, heated upon the water bath until the scarlet crystals of thecompound have made room for the orange-colored crystals of thebisulphite of the aforesaid compound, which will be the case after twohours, cure having been taken to stir it well. The alco- 6o hol is 110wdistilled off, and the residual crystalline mass is allowed to cool. Thecrystals are separated from the suspendingdiquid by filtration, and nowrepresent the bisulphite compound ready for use in the form of pow- 6 5der or of a paste. The bisulphite compound thus obtained-the sulphocompoundis soluble in water with a yellow color. Vhen an alkali is addedto this yellow solution, or when it is boiled with a nitrite, being abisul- 7o phite compound, is easily decomposed, and a bluish-violet saltabove mentioned is pre cipitated.

Having thus described my invention, what I claim as new, and desire tosecure by Let- 7 5 ters Patent, is V A new article of manufacture an azocompound derived from dichlorphenol-beta-n aphthol, being distinguishedby its being soluble in water with a yellow color, and when an al ,kaliis added to the solution, or when boiled with a nitrite, the bisulphitecompound is decomposed and a bluish-violet salt isprecipitated-substantially as set forth.

In testimony whereof I affix my signature in 8 5 presence of twowitnesses."

ADOLPH SPIEGEL, Nitnesses:

F. VOGELER, J. GRUND.

